Question 9

'Defective' means faulty in the context of cystic fibrosis.

In the context of the passage, the word 'defective' refers to a gene that is not functioning correctly, leading to the production of thick and sticky mucus associated with cystic fibrosis. This clearly indicates that 'defective' aligns with the definition of 'faulty.'

A) Unusual

While 'unusual' could imply something that is not common, it does not convey the specific meaning of malfunction or failure associated with the term 'defective.' Thus, this option is incorrect as it does not capture the essence of a gene that is not working properly.

B) Remarkable

'Remarkable' generally describes something worthy of attention or extraordinary, which is the opposite of what 'defective' signifies. A defective gene would not be considered remarkable; therefore, this option is incorrect.

C) Remarkable

This option is a repetition of the previous choice and carries the same meaning. It inaccurately suggests something positive or extraordinary, which does not align with the negative implications of 'defective.' Hence, this option is also incorrect.

D) Faulty

'Faulty' accurately describes something that is flawed or not working as intended, which is precisely what a 'defective' gene does in the context of cystic fibrosis. This makes option D the correct choice, as it captures the necessary meaning within the passage.

Conclusion

Option D, 'faulty,' is the only choice that correctly aligns with the meaning of 'defective' as it pertains to the gene responsible for cystic fibrosis. All other options fail to convey the critical notion of malfunction or failure inherent in the term 'defective,' making them unsuitable in this context. Therefore, 'faulty' is the definitive answer.